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ahucoderahucoder
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Merge pull request #6 from ahucoder/dev
The Facade Pattern
2 parents fec39d8 + 47731e4 commit 8af5ef4

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‎src/main/java/facade/App.java‎

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package facade;
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import facade.dto.TripDetailsDto;
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import facade.facade.TravelFacade;
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import java.time.LocalDate;
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public class App {
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public static void main(String[] args) {
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TripDetailsDto trip = new TripDetailsDto.Builder()
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.customerName("Alice")
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.origin("Beijing")
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.destination("Shanghai")
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.departureDate(LocalDate.of(2025, 6, 7))
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.returnDate(LocalDate.of(2025, 6, 8))
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.build();
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TravelFacade facade = new TravelFacade.Builder()
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.trip(trip)
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.build();
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facade.bookAll();
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}
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}

‎src/main/java/facade/dto/TripDetailsDto.java‎

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package facade.dto;
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import lombok.Getter;
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import java.time.LocalDate;
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@Getter
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public class TripDetailsDto {
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private final String passengerName;
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private final LocalDate departureDate;
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private final LocalDate returnDate;
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private final String origin;
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private final String destination;
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private TripDetailsDto(Builder builder) {
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this.passengerName = builder.customerName;
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this.departureDate = builder.departureDate;
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this.returnDate = builder.returnDate;
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this.origin = builder.origin;
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this.destination = builder.destination;
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}
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public static class Builder {
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private String customerName;
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private LocalDate departureDate;
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private LocalDate returnDate;
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private String origin;
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private String destination;
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public Builder customerName(String name) {
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this.customerName = name;
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return this;
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}
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public Builder departureDate(LocalDate date) {
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this.departureDate = date;
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return this;
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}
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public Builder returnDate(LocalDate date) {
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this.returnDate = date;
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return this;
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}
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public Builder origin(String origin) {
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this.origin = origin;
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return this;
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}
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public Builder destination(String dest) {
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this.destination = dest;
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return this;
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}
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public TripDetailsDto build() {
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if (departureDate.isAfter(returnDate)) {
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throw new IllegalArgumentException("Departure must be before return date");
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}
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return new TripDetailsDto(this);
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}
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}
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}

‎src/main/java/facade/facade/TravelFacade.java‎

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package facade.facade;
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import facade.dto.TripDetailsDto;
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import facade.service.FlightBookingService;
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import facade.service.HotelBookingService;
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import facade.service.PaymentService;
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import facade.service.TaxiBookingService;
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import facade.service.impl.FlightBookingServiceImpl;
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import facade.service.impl.HotelBookingServiceImpl;
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import facade.service.impl.PaymentServiceImpl;
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import facade.service.impl.TaxiBookingServiceImpl;
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public class TravelFacade {
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private final FlightBookingService flightService;
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private final HotelBookingService hotelService;
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private final TaxiBookingService taxiService;
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private final PaymentService paymentService;
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private final TripDetailsDto trip;
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private double totalCost;
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private TravelFacade(Builder builder) {
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this.flightService = new FlightBookingServiceImpl();
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this.hotelService = new HotelBookingServiceImpl();
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this.taxiService = new TaxiBookingServiceImpl();
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this.paymentService = new PaymentServiceImpl();
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this.trip = builder.trip;
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}
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public static class Builder {
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private TripDetailsDto trip;
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public Builder trip(TripDetailsDto trip) {
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this.trip = trip;
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return this;
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}
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public TravelFacade build() {
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if (trip == null) {
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throw new IllegalStateException("TripDetails must be provided");
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}
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return new TravelFacade(this);
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}
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}
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public void bookAll() {
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System.out.println("Start the itinerary booking process...");
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// 1. Flight
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String flightConf = flightService.bookFlight(
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trip.getPassengerName(), trip.getOrigin(), trip.getDestination(), trip.getDepartureDate());
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totalCost += 500.0;
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// 2. Hotel
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String hotelConf = hotelService.bookHotel(
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trip.getPassengerName(), trip.getDestination(), trip.getDepartureDate(), trip.getReturnDate());
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totalCost += 300.0;
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// 3. Taxi
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String taxiConf = taxiService.bookCar(
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trip.getPassengerName(), trip.getDestination(), trip.getDepartureDate(), trip.getReturnDate());
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totalCost += 200.0;
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// 4. Pay
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boolean paid = paymentService.processPayment(trip.getPassengerName(), totalCost);
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if (!paid) {
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throw new RuntimeException("Payment failed, booking cancelled");
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}
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System.out.println("Booking completed! The following is the confirmation information:");
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System.out.println("Flight info: " + flightConf);
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System.out.println("Hotel info: " + hotelConf);
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System.out.println("Taxi info: " + taxiConf);
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System.out.printf("Total cost: %.2f%n", totalCost);
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}
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}

‎src/main/java/facade/service/FlightBookingService.java‎

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package facade.service;
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import java.time.LocalDate;
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public interface FlightBookingService {
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String bookFlight(String passenger, String from, String to, LocalDate date);
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}

‎src/main/java/facade/service/HotelBookingService.java‎

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package facade.service;
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import java.time.LocalDate;
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public interface HotelBookingService {
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String bookHotel(String passenger, String city, LocalDate from, LocalDate to);
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}

‎src/main/java/facade/service/PaymentService.java‎

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package facade.service;
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public interface PaymentService {
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boolean processPayment(String user, double amount);
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}

‎src/main/java/facade/service/TaxiBookingService.java‎

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package facade.service;
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import java.time.LocalDate;
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public interface TaxiBookingService {
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String bookCar(String passenger, String city, LocalDate from, LocalDate to);
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}

‎src/main/java/facade/service/impl/FlightBookingServiceImpl.java‎

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package facade.service.impl;
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import facade.service.FlightBookingService;
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import java.time.LocalDate;
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import java.util.UUID;
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public class FlightBookingServiceImpl implements FlightBookingService {
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@Override
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public String bookFlight(String passenger, String from, String to, LocalDate date) {
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String flightInfo = STR."FLIGHT-\{UUID.randomUUID()}";
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System.out.printf("[%s] booking %s->%s flight for %s, date: %s%n", flightInfo, from, to, passenger, date);
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return flightInfo;
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}
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}

‎src/main/java/facade/service/impl/HotelBookingServiceImpl.java‎

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package facade.service.impl;
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import facade.service.HotelBookingService;
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import java.time.LocalDate;
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import java.util.UUID;
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public class HotelBookingServiceImpl implements HotelBookingService {
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@Override
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public String bookHotel(String passenger, String city, LocalDate from, LocalDate to) {
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String hotelInfo = STR."HOTEL-\{UUID.randomUUID()}";
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System.out.printf("[%s] booking hotel in %s for %s, checkin: %s, checkout: %s%n",
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hotelInfo, city, passenger, from, to);
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return hotelInfo;
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}
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}

‎src/main/java/facade/service/impl/PaymentServiceImpl.java‎

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package facade.service.impl;
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import facade.service.PaymentService;
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public class PaymentServiceImpl implements PaymentService {
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@Override
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public boolean processPayment(String user, double amount) {
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System.out.printf("Processing payment for %s, amount: %.2f%n", user, amount);
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return true;
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}
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}

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